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bugfix: reduce error in edit.hor 

Cursor no longer drifts left as you repeatedly press up/down arrow
within a region of filled screen lines.
This commit is contained in:
Kartik K. Agaram 2024-07-28 20:25:48 -07:00
parent cf7bff30f7
commit aad21bd9a1
1 changed files with 5 additions and 2 deletions
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7
move.lua
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@ -489,15 +489,17 @@ function edit.hor(Editor, loc, x0) -- scans line
local line = Editor.lines[loc.line]
-- look within the screen line
local x = Editor.left
local prevx = nil
for pos,char in utf8chars(line.data, start_pos_of_screen_line) do
local w = Editor.font:getWidth(char)
if char:match('%s') then
if Text.line_wrap_at_word_boundary(Editor, x, line.data, pos) then
return {mode='text', line=loc.line, pos=pos+1}
else
if x+w > x0 then
if (prevx == nil or x0 >= (prevx+x)/2) and x0 < x+w/2 then
return {mode='text', line=loc.line, pos=pos}
end
prevx = x
x = x + w
end
else
@ -505,10 +507,11 @@ function edit.hor(Editor, loc, x0) -- scans line
assert(x0 > x) -- we clicked really far to the right
return {mode='text', line=loc.line, pos=pos}
else
if x+w > x0 then
if (prevx == nil or x0 >= (prevx+x)/2) and x0 < x+w/2 then
return {mode='text', line=loc.line, pos=pos}
end
end
prevx = x
x = x + w
end
end