I'm posting a new version of flPicSee today. It has a right-click menu with some additional zoom levels, an about box, and a very simple help box. It also allows you to select another file with the standard file chooser.
This version has done away with the middle-click zoom-change behavior. Now if you click the left mouse button without dragging, the zoom changes (based on the window size and image size). If, instead, you click and drag the the mouse with the left button, and the image size is larger than the curren window size, the image will be dragged around with the mouse, allowing you to pan the image.
You may still use a mouse scroll wheel to change the zoom settings.
This version is a bit over 14 KB, but the make file has a new build config option that omits the right-click menu stuff and makes flPicSee about 11.5 KB. I hope in later versions to add additional features, so there will be one or more "delux" build configuration options as well.
DISCLAIMER: I've only tested with version 1.3 with JWM so far . Perhaps tonight or sometime soon I'll try with TC 1.4.3 and 2.0 rc2. But if you have any issues with flPicSee, please post a description of it here and your current TinyCore configuration (TC Base version and window manager, at least).
I'll post the source code and make file in reply below.
Hope people find it useful!
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Mike L.