Description of problem:
In the Activities search field, if I type an expression that can be evaluated by the Calculator search plugin, the calculation keeps running even after I close Activities. This becomes a problem when the expression is extremely hard to calculate but easy to type: a good example is "10!!!". This causes the gnome-calculator process to keep running in the background and consuming 100% CPU.
Version-Release number of selected component (if applicable):
Fedora 27 with Gnome 3.26.2.
Steps to reproduce:
1. Enable the Calculator search plugin.
2. Open Activities.
3. Type "10!!!" in the search field. Calculator now attempts to calculate
a ridiculously big factorial.
4. Close activities.
The gnome-calculator process is using 100% of a single core, because the factorial would take ages to compute. Your laptop fan is suddenly whirring for no apparent reason.
The Calculator operation is terminated as soon as the Activities search is closed. There is no surprising CPU usage.
Possibly, the search could also sanitize Calculator input to prevent too demanding calculations, but this seems like a much more complex solution.
This could potentially be a Calculator bug, too. Feel free to reassign it as necessary.
I've also filed an issue on the new Gnome GitLab, because I wasn't sure which place is better for this: https://gitlab.gnome.org/GNOME/gnome-shell/issues/183
I've also tested this on RHEL 7.4 in a VM. The result is the same.
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