在 我做的Delphi资料收集查看软件 里 一直有个Bug：
就是在列选模式或者选中文本的时候有时候会出现这种错误的现象：第一次列选(有问题)
第二次列选(却正常):
试着几次想把问题解决。无奈SynEdit.pas第三方控件源文件里东西太多了，不知道问题出在哪。
一开始以为是在SetSelStart->SetBlockBegin->InvalidateLines()->InvalidateRect() API,测试后没有改善
后来看到有FillChar函数，顺藤摸瓜，发现在有Paint过程->PaintTextLines->PaintToken/PaintHighlightToken
最后才发现Bug所在：在PaintTextLines过程中，
只将全文成
(unselected before, selected, unselected after)三部份。
而没考虑到上面列选时把全文分成若干部份：
(unselected before,
selected, unselected after,
selected, unselected after,
.
.
.
selected, unselected after)
原来部份是：//示意
{================================================================}
If Not Assigned(fHighlighter) Or (Not fHighlighter.Enabled) Then Begin
PaintToken(sToken, nTokenLen, 0, FirstCol, nLineSelStart);
PaintToken(sToken, nTokenLen, 0, nLineSelEnd, LastCol);
PaintToken(sToken, nTokenLen, 0, nLineSelStart, nLineSelEnd - 1);
End
Else Begin
PaintHighlightToken(True);
End;
{================================================================}
我也不想再深入改人家的代码就稍微改成这样子：
{================================================================}
If Not Assigned(fHighlighter) Or (Not fHighlighter.Enabled) Then Begin
//PaintToken(sToken, nTokenLen, 0, FirstCol, nLineSelStart);
//PaintToken(sToken, nTokenLen, 0, nLineSelEnd, LastCol);
//PaintToken(sToken, nTokenLen, 0, nLineSelStart, nLineSelEnd - 1);
End
Else Begin
PaintHighlightToken(True);
End;
PaintToken(sToken, nTokenLen, 0, FirstCol, nLineSelStart);
PaintToken(sToken, nTokenLen, 0, nLineSelEnd, LastCol);
PaintToken(sToken, nTokenLen, 0, nLineSelStart, nLineSelEnd - 1);
{================================================================}
