1. rename s_hdc to s_hdc_real
2. creat a off-screen HDC named s_hdc, all the drawing from gui_win32.c should be redirected to it.
3. BitBlt from s_hdc to s_hdc_real after WndProc, the screen should be updated.
It works in most of time, but when I press CTRL+D to scroll down half a screen
I find only the bottom half of TextArea has been updated, the top half hasn't been updated yet, there are still old characters before CTRL+D on the top half.
I search all the reference of s_hdc and s_textArea but can not find any clue.
Can anybody figure out what's wrong here ?
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