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[Memory Profiler] Table view totals display '?' until selecting them when comparing two Snapshots

Package: Memory Profiler


How to reproduce:
1. Open the attached "case_1401544" project
2. Open the "Window -> Analysis -> Memory Profiler" window from the menu
3. Compare the "Test1" and "Test2" Snapshots under the "Compare Snapshots" pane
4. Select the "Objects and Allocations" view
5. Select and preview the values of the "Diff Raw Data" at the bottom of the view

Expected result: "Diff Raw" values are displayed properly
Actual result: '?' symbol is displayed instead of the "Diff Raw" values

Reproducible with: 0.4.0-preview.1, 0.5.1-preview.1 (2019.4.36f1, 2020.3.30f1, 2021.2.13f1, 2022.1.0b9. 2022.2.0a5)
Couldn't test with: 0.2.10-preview.1 (2019.4.36f1, 2020.3.30f1, 2021.2.13f1, 2022.1.0b9. 2022.2.0a5) (Snapshot comparison is unavailable)

Workaround: Values are displayed after selecting one of the "Diff Raw" values

  1. Resolution Note:

    The question-mark is there because the table doesn't calculate ahead of time how many rows it contains when comparing the two sets of data. It only calculates that count in the first opening as an optimization to speed up the processing of snapshot comparisons.

    Additionally, these tables will likely be removed and comparison views will be redone in a future version of the tool.

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