#49 unexpected highlighting/selection

[SweetTyler]

It’s strange, but I suspect it may be related to the “File Modified” dialog that pops up.

Steps to reproduce (on Linux):

1) Compile the following C code and run the generated executable (for example, "printsomething"). Redirect the output to a file (for example, "aa") using command "printsomething > aa".

#include <stdio.h>
#include <unistd.h>
#include <time.h>

int main()
{
    struct timespec ts;
    ts.tv_sec = 0;
    ts.tv_nsec = 200000000;   // 200 million ns = 0.2 seconds

    for (int i = 0; i < 10000; i++) {
        printf("Loop iteration ...................................... %d\n", i);
        fflush(stdout);
        nanosleep(&ts, NULL);
    }
    return 0;
}

2) Open another terminal and launch xnedit to open the file "aa".

3) Click anywhere in the file and wait for the “File has been modified” dialog to appear. Click the “Reload” button, then scroll the mouse wheel slowly (not too slow).

You will very likely notice that while scrolling, some text becomes selected and highlighted as shown in the attached screenshot.

[SweetTyler]

Here is the snapshot.

[SweetTyler]

My system is Fedora 43. Xnedit source code is the latest version downloaded from GitHub.

[SweetTyler]

I forgot to mention that the following settings in nedit.rc are needed to reproduce the issue:

nedit.warnFileMods: True
nedit.warnRealFileMods: True

I also found that if I set the second "resp" (lines 2561–2574 in file.c) to "1" directly, without calling DialogF(), the issue disappears in this test case.

    XUngrabPointer(XtDisplay(window->shell), timestamp);
    if (window->fileChanged)
        resp = DialogF(DF_WARN, window->shell, 2,
                "File modified externally",
                "%s has been modified by another program.  Reload?\n\n"
                "WARNING: Reloading will discard changes made in this\n"
                "editing session!", "Reload", "Cancel", window->filename);
    else
        resp = DialogF(DF_WARN, window->shell, 2,
                "File modified externally",
                "%s has been modified by another\nprogram.  Reload?",
                "Reload", "Cancel", window->filename);
    if (resp == 1)
        RevertToSaved(window, NULL);

Please let me know if you need more information or if I can help investigate further.