This commit adds a basic change-watcher of a loaded file with auto-up…

[susnicek]

Dear developer,

first of all I must thank you very much for GPXSee map viewer, which is free and is perfect! Please, take this pull request as an inspiration for implementation of an auto-update system of loaded files. I use this feature for displaying current coordinates from my GPS device. My external script downloads data from GPS device and writes them into a file, which is loaded in GPXSee program. With the introduced auto-update system the position from my GPS device is updated after each file change. My pull request introduces this feature in its simplest form. The feature is implemented as default and cannot be switched off. It is so because I did not want to modify your GUI and wanted you to decide how to implement the switching on or off the feature. I hope that you will find the idea interesting and aligned with your future vision of GPXSee map viewer.

Best regards, Susnicek

[tumic0]

Hi. The idea of auto-updates is nice. I would not see this as the optimal way how to obtain the device's location - there is QtPositioning for that - but it may be quiet usable as a "poor man's live tracking system". However, it requires some more changes in the GUI, the paths rendering logic (the markers) and maybe also in the path info handling to make it a real feature. But I will have a look at it.

[susnicek]

Yes, I agree, it definitely needs more changes (also e.g. zoom handling on file update). Thank you very much for having a look at it.

Best regards, Susnicek