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Fix scrolling generating invalid buffer coordinates

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This commit is contained in:
Maxime Coste 2016-12-07 00:08:41 +00:00
parent a320dcec28
commit d9679db9b6
1 changed files with 8 additions and 7 deletions
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15
src/input_handler.cc
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@ -1515,14 +1515,15 @@ void scroll_window(Context& context, LineCount offset)
SelectionList& selections = context.selections();
const BufferCoord cursor = selections.main().cursor();
auto clamp_line = [&](LineCount line) { return clamp(line, 0_line, line_count-1); };
auto min_line = clamp_line(win_pos.line + scrolloff.line);
auto max_line = clamp_line(win_pos.line + win_dim.line - 1 - scrolloff.line);
BufferCoord min_coord{min_line, buffer[min_line].byte_count_to(win_pos.column)};
BufferCoord max_coord{max_line, buffer[max_line].byte_count_to(win_pos.column)};
selections = SelectionList{buffer, clamp(cursor, min_coord, max_coord)};
using std::min; using std::max;
auto line = clamp(cursor.line, max(0_line, win_pos.line + scrolloff.line),
min(line_count-1, win_pos.line + win_dim.line - 1 - scrolloff.line));
// This is not exactly a clamp, and must be done in this order as
// byte_count_to could return line length
auto col = min(max(cursor.column, buffer[line].byte_count_to(win_pos.column)),
buffer[line].length()-1);
selections = SelectionList{buffer, BufferCoord{line, col}};
window.set_position(win_pos);
}