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-rw-r--r--source_text.lua23
-rw-r--r--source_text_tests.lua22
-rw-r--r--text.lua23
-rw-r--r--text_tests.lua22
4 files changed, 72 insertions, 18 deletions
diff --git a/source_text.lua b/source_text.lua
index 4cf3edd..1c91f28 100644
--- a/source_text.lua
+++ b/source_text.lua
@@ -247,9 +247,10 @@ function Text.keychord_press(State, chord)
       local line_cache = State.line_cache[#State.line_cache]
       State.screen_top1 = {line=#State.lines, pos=line_cache.screen_line_starting_pos[#line_cache.screen_line_starting_pos]}
     elseif Text.lt1(State.cursor1, State.screen_top1) then
-      local top2 = Text.to2(State, State.screen_top1)
-      top2 = Text.previous_screen_line(State, top2, State.left, State.right)
-      State.screen_top1 = Text.to1(State, top2)
+      State.screen_top1 = {
+        line=State.cursor1.line,
+        pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
+      }
       Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
     end
     Text.clear_screen_line_cache(State, State.cursor1.line)
@@ -465,9 +466,11 @@ function Text.up(State)
 --?     print('cursor pos is now '..tostring(State.cursor1.pos))
   end
   if Text.lt1(State.cursor1, State.screen_top1) then
-    local top2 = Text.to2(State, State.screen_top1)
-    top2 = Text.previous_screen_line(State, top2)
-    State.screen_top1 = Text.to1(State, top2)
+    State.screen_top1 = {
+      line=State.cursor1.line,
+      pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
+    }
+    Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
   end
 end
 
@@ -606,9 +609,11 @@ function Text.left(State)
     end
   end
   if Text.lt1(State.cursor1, State.screen_top1) then
-    local top2 = Text.to2(State, State.screen_top1)
-    top2 = Text.previous_screen_line(State, top2)
-    State.screen_top1 = Text.to1(State, top2)
+    State.screen_top1 = {
+      line=State.cursor1.line,
+      pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
+    }
+    Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
   end
 end
 
diff --git a/source_text_tests.lua b/source_text_tests.lua
index 2385325..7a7d71c 100644
--- a/source_text_tests.lua
+++ b/source_text_tests.lua
@@ -1251,6 +1251,28 @@ function test_up_arrow_scrolls_up_by_one_line()
   App.screen.check(y, 'ghi', 'screen:3')
 end
 
+function test_up_arrow_scrolls_up_by_one_line_skipping_drawing()
+  -- display lines 3/4/5 with a drawing just off screen at line 2
+  App.screen.init{width=120, height=60}
+  Editor_state = edit.initialize_test_state()
+  Editor_state.lines = load_array{'abc', '```lines', '```', 'def', 'ghi', 'jkl'}
+  Text.redraw_all(Editor_state)
+  Editor_state.cursor1 = {line=3, pos=1}
+  Editor_state.screen_top1 = {line=3, pos=1}
+  Editor_state.screen_bottom1 = {}
+  edit.draw(Editor_state)
+  local y = Editor_state.top
+  App.screen.check(y, 'def', 'baseline/screen:1')
+  y = y + Editor_state.line_height
+  App.screen.check(y, 'ghi', 'baseline/screen:2')
+  y = y + Editor_state.line_height
+  App.screen.check(y, 'jkl', 'baseline/screen:3')
+  -- after hitting the up arrow the screen scrolls up to previous text line
+  edit.run_after_keychord(Editor_state, 'up')
+  check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
+  check_eq(Editor_state.cursor1.line, 1, 'cursor')
+end
+
 function test_up_arrow_scrolls_up_by_one_screen_line()
   -- display lines starting from second screen line of a line
   App.screen.init{width=Editor_state.left+30, height=60}
diff --git a/text.lua b/text.lua
index 1267699..6a1ef2d 100644
--- a/text.lua
+++ b/text.lua
@@ -230,9 +230,10 @@ function Text.keychord_press(State, chord)
       local line_cache = State.line_cache[#State.line_cache]
       State.screen_top1 = {line=#State.lines, pos=line_cache.screen_line_starting_pos[#line_cache.screen_line_starting_pos]}
     elseif Text.lt1(State.cursor1, State.screen_top1) then
-      local top2 = Text.to2(State, State.screen_top1)
-      top2 = Text.previous_screen_line(State, top2, State.left, State.right)
-      State.screen_top1 = Text.to1(State, top2)
+      State.screen_top1 = {
+        line=State.cursor1.line,
+        pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
+      }
       Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
     end
     Text.clear_screen_line_cache(State, State.cursor1.line)
@@ -448,9 +449,11 @@ function Text.up(State)
 --?     print('cursor pos is now '..tostring(State.cursor1.pos))
   end
   if Text.lt1(State.cursor1, State.screen_top1) then
-    local top2 = Text.to2(State, State.screen_top1)
-    top2 = Text.previous_screen_line(State, top2)
-    State.screen_top1 = Text.to1(State, top2)
+    State.screen_top1 = {
+      line=State.cursor1.line,
+      pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
+    }
+    Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
   end
 end
 
@@ -589,9 +592,11 @@ function Text.left(State)
     end
   end
   if Text.lt1(State.cursor1, State.screen_top1) then
-    local top2 = Text.to2(State, State.screen_top1)
-    top2 = Text.previous_screen_line(State, top2)
-    State.screen_top1 = Text.to1(State, top2)
+    State.screen_top1 = {
+      line=State.cursor1.line,
+      pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
+    }
+    Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
   end
 end
 
diff --git a/text_tests.lua b/text_tests.lua
index d08848a..7cf980b 100644
--- a/text_tests.lua
+++ b/text_tests.lua
@@ -1281,6 +1281,28 @@ function test_up_arrow_scrolls_up_by_one_line()
   App.screen.check(y, 'ghi', 'screen:3')
 end
 
+function test_up_arrow_scrolls_up_by_one_line_skipping_drawing()
+  -- display lines 3/4/5 with a drawing just off screen at line 2
+  App.screen.init{width=120, height=60}
+  Editor_state = edit.initialize_test_state()
+  Editor_state.lines = load_array{'abc', '```lines', '```', 'def', 'ghi', 'jkl'}
+  Text.redraw_all(Editor_state)
+  Editor_state.cursor1 = {line=3, pos=1}
+  Editor_state.screen_top1 = {line=3, pos=1}
+  Editor_state.screen_bottom1 = {}
+  edit.draw(Editor_state)
+  local y = Editor_state.top
+  App.screen.check(y, 'def', 'baseline/screen:1')
+  y = y + Editor_state.line_height
+  App.screen.check(y, 'ghi', 'baseline/screen:2')
+  y = y + Editor_state.line_height
+  App.screen.check(y, 'jkl', 'baseline/screen:3')
+  -- after hitting the up arrow the screen scrolls up to previous text line
+  edit.run_after_keychord(Editor_state, 'up')
+  check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
+  check_eq(Editor_state.cursor1.line, 1, 'cursor')
+end
+
 function test_up_arrow_scrolls_up_by_one_screen_line()
   -- display lines starting from second screen line of a line
   App.screen.init{width=Editor_state.left+30, height=60}
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-14 17:34:29 +0000