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X11: update XDND protocol from version 4 to 5 (#988)

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Some applications insist on sending XDND protocol version 5 and
rejected (ignored) FLTK as DND receiver because we allowed only
protocol version 4. Known apps: Google Chrome and Chromium.

This commit enables XDND protocol version 5 in FLTK programs as
DND receiver.
This commit is contained in:
Albrecht Schlosser
2024-06-15 11:33:44 +02:00
parent 7d98413d46
commit 3cc5c090f9
1 changed files with 18 additions and 13 deletions
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src/Fl_x.cxx
+14 -9
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@@ -580,7 +580,6 @@ void open_display_i(Display* d) {
fl_XdndStatus = XInternAtom(d, "XdndStatus", 0);
fl_XdndActionCopy = XInternAtom(d, "XdndActionCopy", 0);
fl_XdndFinished = XInternAtom(d, "XdndFinished", 0);
fl_XdndEnter = XInternAtom(d, "XdndEnter", 0);
fl_XdndURIList = XInternAtom(d, "text/uri-list", 0);
fl_Xatextplainutf = XInternAtom(d, "text/plain;charset=UTF-8",0);
fl_Xatextplainutf2 = XInternAtom(d, "text/plain;charset=utf-8",0); // Firefox/Thunderbird needs this - See STR#2930
@@ -1471,13 +1470,19 @@ int fl_handle(const XEvent& thisevent)
}
Fl::e_number = old_event;
// Detect if this paste is due to Xdnd by the property name (I use
// XA_SECONDARY for that) and send an XdndFinished message. It is not
// clear if this has to be delayed until now or if it can be done
// immediately after calling XConvertSelection.
if (fl_xevent->xselection.property == XA_SECONDARY &&
fl_dnd_source_window) {
fl_sendClientMessage(fl_dnd_source_window, fl_XdndFinished,
fl_xevent->xselection.requestor);
// XA_SECONDARY for that) and send an XdndFinished message.
// This has to be delayed until now rather than sending it immediately
// after calling XConvertSelection because we need to send the success
// status (retval) and the performed action to the sender - at least
// since XDND protocol version 5 (see docs).
// [FIXME: is the condition below really correct?]
if (fl_xevent->xselection.property == XA_SECONDARY && fl_dnd_source_window) {
fl_sendClientMessage(fl_dnd_source_window, // send to window
fl_XdndFinished, // XdndFinished message
fl_xevent->xselection.requestor, // data.l[0] target window
retval ? 1 : 0, // data.l[1] Bit 0: 1 = success
retval ? fl_dnd_action : None); // data.l[2] action performed
fl_dnd_source_window = 0; // don't send a second time
}
return 1;
@@ -2686,7 +2691,7 @@ void Fl_X::make_xid(Fl_Window* win, XVisualInfo *visual, Colormap colormap)
}
// Make it receptive to DnD:
long version = 4;
Atom version = 5; // max. XDND protocol version we understand
XChangeProperty(fl_display, xp->xid, fl_XdndAware,
XA_ATOM, sizeof(int)*8, 0, (unsigned char*)&version, 1);