Memoizes the functions for getting header both runs and scalar data tables #6835
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Motivation for features / changes
Using functions in Angular templates leads to unnecessary recomputation, e.g. getHeaders() is called 60 times from data tables on init and add). More seriously, they also interfere with other component usage like CDK Overlay: namely, when an Overlay is set to appear next to a header, the header element is destroyed and recreated (because of the function in the template) before the Overlay can position itself, and ends up always resetting its position to (0,0). Simply memoizing the function will prevent the recomputation (Angular ref).
Profiling the memoized change (using Chrome devtools profiler, which is admittedly a bit inconsistent) seems to show a several 100ms improvement in scripting performance.
Technical description of changes
Replaces the
getHeadersfunctions used in scalar/runs data tables with a new memoizedextendHeaders(headers)function.No change in UI behavior.
Screenshots of UI changes (or N/A)
N/A