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On 26.07.2016 22:19, Kaz Kylheku wrote:
The test program featured below works fine under the Cygwin console window. If executed from a cmd.exe console, strange things happen with the cmd.exe window. Suddenly, the window spontaneously resizes so that is taller than the desktop. A horizontal scrollbar may appear in it also, as well as an unpainted area through which the desktop is visible. As soon as you try to grab the title bar to resize it, it disappears. It hasn't quit; it is actually minimized. You can maximize it from the task bar and then resize the tall window to its original shape.
Narrowed it down to the con.scroll_window call in fhandler_console::clear_screen. The following test change makes the behavior go away. Moreover, the repeated clear screen requests stop making the vertical scroll bar jump around like crazy:diff --git a/winsup/cygwin/fhandler_console.cc b/winsup/cygwin/fhandler_console.cc
index 5fe4480..2b8acb5 100644 --- a/winsup/cygwin/fhandler_console.cc +++ b/winsup/cygwin/fhandler_console.cc@@ -1261,7 +1261,9 @@ fhandler_console::clear_screen (cltype xc1, cltype yc1, cltype xc2, cltype yc2)
/* Detect special case - scroll the screen if we have a buffer in order to/* Detect special case - scroll the screen if we have a buffer in order to
preserve the buffer. */ +#if 0 if (!con.scroll_window (h, x1, y1, x2, y2)) +#endif con.clear_screen (h, x1, y1, x2, y2); } -- Problem reports: FAQ: Documentation: Unsubscribe info: