qml: improve history list scrolling performance#10615
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Disables the Material design ovelay background on HistoryItemDelegate to prevent flickering when scrolling and loading the app. Sets reuseItems and cacheBuffer in history ElListView to reuse delegate instances instead of destroying and re-creating them each time they become (in-)visible. This makes scrolling through a large history smoother.
From the Qt docs (https://doc.qt.io/qt-6/qml-qtquick-image.html#sourceSize-prop): ``` Unlike the width and height properties, which scale the painting of the image, this property sets the maximum number of pixels stored for the loaded image so that large images do not use more memory than necessary. ``` When we want to display e.g. the clock icon in iconSizeLarge we only need to keep iconSizeLarge with/height pixels in memory instead of the whole 256x256 icon.
Don't update the fiat values during scrolling through the history with the thing on the right side (drag scrolling), this should improve the performance of the list when doing a quick drag scroll.
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Some performance improvements attempting to make scrolling through a large history smoother on QML.