From ab3c6967fa6df7ef1277ed1dc7d79bc6cde54989 Mon Sep 17 00:00:00 2001 From: richardsheridan Date: Tue, 18 Aug 2020 09:51:45 -0400 Subject: [PATCH 1/2] use after idle after 0 incantation for TkTimer --- lib/matplotlib/backends/_backend_tk.py | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py index b2b8a57191fc..2b00f6b1e8e5 100644 --- a/lib/matplotlib/backends/_backend_tk.py +++ b/lib/matplotlib/backends/_backend_tk.py @@ -96,7 +96,16 @@ def _on_timer(self): # if _timer is None, this means that _timer_stop has been called; so # don't recreate the timer in that case. if not self._single and self._timer: - self._timer = self.parent.after(self._interval, self._on_timer) + if self._interval: + self._timer = self.parent.after(self._interval, self._on_timer) + else: + # Edge case: Tcl after 0 *prepends* events to the queue + # so a 0 interval does not allow any other events to run. + # This incantation is cancellable and runs as fast as possible + # while also allowing events and drawing every frame. GH#18236 + self._timer = self.parent.after_idle( + lambda: self.parent.after(self._interval, self._on_timer) + ) else: self._timer = None From 5ca19cde4b5150f854c53bf96073060f688c9ed8 Mon Sep 17 00:00:00 2001 From: richardsheridan Date: Tue, 18 Aug 2020 15:39:33 -0400 Subject: [PATCH 2/2] boolean check to int comparison Co-authored-by: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com> --- lib/matplotlib/backends/_backend_tk.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py index 2b00f6b1e8e5..c31c3eda5e18 100644 --- a/lib/matplotlib/backends/_backend_tk.py +++ b/lib/matplotlib/backends/_backend_tk.py @@ -96,7 +96,7 @@ def _on_timer(self): # if _timer is None, this means that _timer_stop has been called; so # don't recreate the timer in that case. if not self._single and self._timer: - if self._interval: + if self._interval > 0: self._timer = self.parent.after(self._interval, self._on_timer) else: # Edge case: Tcl after 0 *prepends* events to the queue pFad - Phonifier reborn

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